Just as the internet allows users to create and share their own media, it is also enabling them to organize digital material their own way, rather than relying on pre-existing formats of classifying information. A December 2006 survey by the Pew Internet & American Life Project has found that 28% of internet users have tagged or categorized content online such as photos, news stories or blog posts. On a typical day online, 7% of internet users say they tag or categorize online content.
Here are the results of the survey...

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Demographics of Taggers
28% of online Americans say they have tagged content like a photo, a news story
or a blog post

Proportion of all Americans in the group who are taggers

Men 29%

Women 27%

Race/ethnicity

White, non-Hispanic 26%

Black, non-Hispanic 36%

English-speaking
Hispanic* 33%

Age

18-29 32%

30-49 31%

50-64 23%

65+ 18%

Educational attainment

High school diploma 24%

Some college 28%

College degree + 31%

Household income

$30K-$49,999 28%

$50K-$74,999 27%

$75,000+ 36%

Internet connection at home

Dial up 23%

Broadband 38%

Source: Pew Internet & American Life Project December 2006 tracking survey. (N for internet users=1,623. Margin of error is ±3%).

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Tagging is done somewhat differently at different websites. Here are some links that illustrate more fully how the tagging process is done: